Loans and the Allowance for Loan and Lease Losses (Details) - Schedule of accretable yield, or income expected to be collected - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Schedule of accretable yield, or income expected to be collected [Abstract]
Beginning balance	$ 3,599	$ 4,805
Accretion of income	(183)	(54)
Ending balance	$ 3,416	$ 4,751

Loans and leases receivable purchased loans accretion of income.

No definition available.

Name:	cnob_LoansAndLeasesReceivablePurchasedLoansAccretionOfIncome
Namespace Prefix:	cnob_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration